John I have an AyA number 1 from about the same period; 1969. I understand the Number 1's at that time were engraved and hardened here in England. Mine is a two barrel set Imp/cyl x 1/2 choke and 1/2 choke and full. Unfortunately it has a single trigger. Good buys second hand but devilishly expensive new. True a good used Number 1 is a lot less than a new Number 2. I paid 3,500 and it is in about 90% condition. Arrietas are good but there are many models at different prices. Lagopus.....