From what I can surmise, that adapter is a "VM 1101". Do you see any sort of model # on your adapter? Looks like this one:
http://www.thevoiceofmusic.com/catal...29&Categories=
I don't really want to spend $29 for a refurbished one at this point, but I found this one on ebay which appears to be the same one:
http://www.ebay.com/itm/METAL-Vintag...item2a44217512
It's an auction so who knows what it'll actually go for, but I'd pay the opening price if that's the right one. Does that one also look right to you? The action has great pics so I think the comparison should be easy.