hope people don't think this is too boring - another example of me trying this new method of magnifying some small things

Pics. taken thru a single lens., and will relate to another post that I propose to send regarding a piece of Stuart 'apple green' Stratford pattern. The first image is something I have shown previously, once, and is I believe possibly the earliest of their acid etched marks - and to the best of my knowledge (always a fatal thing to say) is not shown in print anywhere.
Unlike subsequent marks, it has an 's', and may in fact date prior to 1926. The others are dated variously from about 1926 to 1950, although those with an elongated 'tail' on the 't' are probably the earliest within this period. I am of course quoting from professional sources, and if I have mis-quoted or mis-interpreted any details I apologise, and please do correct me promptly. To possibly help me with the next post, I wud be very interested if someone is able to confirm at what date Stuart dropped showing the Rd. Nos. as part of the back stamp, although with my luck it was probably phased out over a long period.
References: 'British Glass Between The Wars' - Edited by Roger Dodsworth - Exhibition Catalogue for Broadfield House - first printing 1987.