I alway s come back to the days in the late 60s and early 70s working on the cash desk in my dad's shop. A few random thoughts; Silver from the whole of George V's reign was pretty common i.e. 1911 up, but it did get scarcer as time went on. The oldest silver I can recall was an 1872 florin (just legible) but that was the only Gothic I ever saw. Anything pre-1911 was pretty scarce. Pre-1947 silver was still around but getting fairly shabby by that time, say Fine max. Unpleasant to handle as worn coins tend to stick together. I never saw a 'Standing Britannia' florin in circulation so extrapolating that fact, I would say that the 1950s is way too late for the demise of the Gothic florin. I would guess that other than the odd straggler they dropped out of use around the time of the First World War; Banks withdraw underweight coins for the simple reason that, certainly at that time, change was weighed into bags and not counted. Worn coins therefore mess up their calculations. 92.5% silver wears very quickly, much more so than today's cupro-nickel issues and after 20 or so years we are perhaps talking Fine. It was not unusual to see at say 1970, the George V Modified Effigy series with the legend at least half worn away. I find the actual use of coins in circulation and how they wear to be a fairly absorbing topic. More thoughts as they occur to me.