Just got this in from eBay. I couldn't make out the stamp from the seller's photo, but I thought I would give it a go because my RAD is extremely vulnerable to dip-at-the-toe stubbys. Upon examination, it still leaves me in the dark. It says LISBON but the stamp is stacked as shown. Anyone ever seen this stamp before? I don't think it is a Warburton of any sort, but who it could be, I can't find.
Name:  partial clean.jpg
Views: 75
Size:  80.3 KBName:  DSCN3035.jpg
Views: 71
Size:  50.8 KB