AMA is a brand name owned by G.E. Betterton of Leatherhead, England, who sell hairdressing equipment and has been for 60 years.
The AM razor is their own-brand but the razor is made by Dovo and stamped. I know, because not only does it show that clearly in the picture on Amazon but I rang them up and asked them.
So I bought one, £41 including postage brand new, considerably cheaper than the cheapest Dovo branded 'Dovo.'
Why the difference? Why does £25 fall off the price because it's got AMA rather attractively set in metal in the scales?
I don't know. I'm just glad I made the phone call!