Help To Identify

Thanks, DCH! 1515-46? I suppose then, looking at it now, the date is 1516. I can see "151" and then "6" after the key. No luck there, I already have 1516 in my collection. I even have two....well, at least it will be my oldest date with three different coins.

I must say, "Coin de Cologne" is much more fun than "Eau the Cologne". Not to put down any collectors of water, this is just my opinion, I know preferences will vary.