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Grimwade records Alexander Glass as entering a bucklemakers mark on 23th June 1775 at 237, High Holborn.

He was succeeded at 237 High Holborn by Samuel Beedall who entered a mark there on 9th January 1776

Apparently moved, without advising Goldsmiths Hall, to 306, High Holborn by 1780

1780 SUN 1 285 22\02\78 Policy Number 431298 Insured Value £1000
Insured Alexander Glass, Silversmith , Toy and Hardwareman, 306 High Holborn

The probate on 5th August 1799 of the will of Alexander Glass , Silversmith of New Elvet in or near Durham may relate but there is no record of him at the Newcastle Assay office in Gill.

Hello Clive

Web-sites extracts of London Trade Directories confirm that Alexander Glass moved to 306 High Holborn in 1780. He was still there in 1786 trading as a silversmith, jeweller and in precious metals.
The earlier Trade Directories from 1774 at 237 High Holborn put the trade emphasis on the hardware trade and do not mention silver until 1778.

Mike

There is a burial record dated 31st March 1784 for an Alexander Glass of High Holborn at St Andrew, Holborn.