Marks and dating
In most cases, pontil marks, labels and signatures can give a good general idea when a piece was made rather than a specific date. It should be remembered that paper labels in particular could be attached to pieces after general use of the label had been phased out, such as using up of old stock at a later date. Signatures engraved on the item sometimes has a specific year indicated.
More pictures are available on page 134 of Mark Hill's book .
Broken pontil mark
Broken pontil marks were left when the pontil rod was broken off and left unfinished. These are characteristic of very early experimental pieces made in 1972 and early ranges made up to mid-1973. Some other later pieces have broken pontil marks, including some experimental and trial pieces, all attenuated bottles and the British Museum design.
This broken pontil mark was on an Aurene attenuated bottle.
Coachbolt pontil mark
The coachbolt prunt was used from mid- to late-1973 only. Here it is with Michael Harris's signature.
Flame pontil mark
The flame pontil mark, with the flame part on the left hand side, was used from 1974 to 1979, and much less frequently thereafter. Last use was about 1982. Therefore, generally speaking, the flame mark is a 1970s mark. Note that the flame mark was also used on St. John's Glass from the Isle of Man and Kerry Glass. Kerry Glass can have the flame on the left hand side (early pieces) or the right hand side (from some time in the early 1980s to 1985).
- Black flame on white vertical oblong label, 9.5 mm wide x 15.5 mm long, used 1973 to mid-1970s.
- In the early to mid 1970s two white horizontal oblong labels with black text were used. The label with 'England' may be later than the label without 'England', but it is not certain.
The label above is 31.5 mm wide x 9.5 mm deep. This label is known from a Seaward globe vase made late 1973.
The oblong label that says 'Handmade Isle of Wight' is sometimes found together with the flame label above, so they are contemporaneous.
- Black horizontal oblong label with white text, used late 1970s.
- Triangular label used from 1978 to 1991. The label came in two sizes: large (34 mm corner to corner), which is rarely seen; and small (18 mm corner to corner), which is by far the most common. The only example of the larger label thus far seen was on a vase made in 1991. Therefore, perhaps the larger triangular label dates to the end of the period when this shape was used.
- British Design Council award label, 31 mm in diameter. Used 1979 and shortly thereafter on pieces of Azurene. A picture of the award certificate can be seen by clicking here. It is signed by the Design Council's chairman, Viscount Caldecote, and director, Keith Grant.
- Labels on a Lace Pink egg-shaped paperweight, including the label of the Design Centre London, c. 1988-1991.
- Gold on black square label, 12 x 12 mm, used 1992-1995. This label was used mostly in 1992 and 1993.
- Black on gold square label, 12.5 mm wide x 12 mm high, used 1992-1995.
- Black on transparent plastic label, used 1992 to present.
- Black on gold rectangular label, 13.5 mm wide x 10.5 mm high, probably used in the mid-1990s. This label is rarely seen. The design seems to be the forerunner of the label with 'The Original' added on the bottom shown immediately below.
- Black on gold square label, with 'The Original', used from 1996 to 2014. A new label was designed when the studio restarted production at Arreton Barns in March 2014, but stock of the old label was used up during 2014.
- Gift of the Year 2001 was awarded to Wild Garden designed by Timothy Harris. The label is very rarely seen still attached to a piece, as it is in this example. It is 15 mm in diameter.
- 30th anniversary label, 14 mm wide x 26 mm high, used 2003-2004.
- First label designed for the studio after the move to Arreton Barns, used from late summer 2014 until summer 2016.
Silver, white and gold labels used since summer 2016. The choice of label depended on the glass piece to which it was attached, to avoid an excessive clash of colour.
Marks incorporated into the design
The IOWSG logo was incorporated into the design of (some?) early graal pieces by Jonathan Harris. It is known in a perfume bottle dated 1989 (image on the left), one of the earliest pieces of graal produced, and a bowl dated 1990 (image on the right courtesy of Sue Burt).
Marks added using transfers
The Peacock Feathers design for Liberty of London was produced between 1987 to the early 1990s. They had "LIBERTY" on the pieces, generally near the base. The picture here has been blown up to make it clearer. On the pieces themselves the mark can be difficult to see because of the combination of black lettering on a dark blue background.
The Isle of Wight Glass logo here is on a Renaissance cylinder vase produced in 1989. Image courtesy of Kelv Gibbs.
Signatures of the Harris family are shown below. More pictures are available on pages 137 and 138 of Mark Hill's book . For signatures of other glass makers who worked at IOWSG please refer to the page for the Glassblower's Shelf.
Signature of Michael Harris on a Blue and White Swirls bell vase made in 1973.
Signature of Michael Harris on an Azurene fish vase made c.1985-1987.
Signature of Michael Harris on a Seascape bowl.
Signature of Michael Harris on a 1970s globe paperweight.
Signature of Michael Harris on a globe paperweight with 'England' added.
Jonathan Harris's signature on a Renaissance perfume bottle made in 1989.
Jonathan Harris's signature on a Renaissance vase made in 1989. Note that the 'H' of 'Harris and 'E' of 'England are different from the signature above.
Jonathan Harris's signature on a Nightscape perfume bottle made in the early 1990s.
This inscription was on an early experimental piece of graal made in 1989. It is in the hand of Jonathan Harris.
This is one of the earliest signatures of Timothy Harris. It was on an experimental piece from the early 1980s. It is unusual in that it is signed "T Harris I.O.W.". Later signatures, it is believed, never abbreviate the first name.
Timothy Harris's signature on a Charleston vase made in 1994.
Signature of Timothy Harris on a piece made exclusively for Isle of Wight Glass Museum. The inscription says "Timothy Harris IOW Glass for IOWGM 2016." The first piece with this signature was sold on 12th April 2016.
Advertising pieces and signs
Isle of Wight Studio Glass 'The Original' sign, 9.3 x 9.3 cm. This logo was used 1996-2012. It is not certain when this little free-standing plastic sign was made.
Advertising block, 10 cm square, with colours similar to Summer Fruits 'Mulberry' and a black transfer print. The block is hollow and not a solid piece of glass. There is a hole at the back. It was probably made after 2006.
'Hot Stuff' pin badge, 37 mm in diameter.