The little AyA boxlock Number 4 model; which was the ejector type with the Number 3 being identical except non-ejector, goes for around 1,000 to 1,200 in England if in good to new condition with the Number 3 about 750 to 850. You will find that it has; or should have, 3 inch chambers. Neat little guns. I have a Number 4 .410 and a Number 3 in 28 bore. The 28 is a delight to use and slightly lighter than the .410 as the barrel wall thickness at the breech is not as thick. The .410is still fun to use but doesn't have the balance and swingability of the 28. Lagopus.....