I think it's a mutilation, the same as using a razor to create a straight-edge where there were once perforations.
While there may be exceptions for generally recognized "private perforations" (e.g. some German-Austria as noted in Scotts) I would say the stamp may still be fun to have in your collection (and noted as such) but the value would be a small fraction of the unaltered stamp.
Just an opinion, with no expertise implied.
I agree, but it's still interesting to have in the collection. Thankfully it's a low valued stamp anyway!
The key word here is "mutilated" which by definition means something that's not normal, therefore a mutilated stamp should have less value than a normal stamp, otherwise everyone would be mutilating stamps on purpose to give them more value.
Sorry I can't do a scan, you just have to trust me! I have a copy of the blue Newfoundland seal stamp #40 that instead of being rouletted has been privately perforated. It's a nice used copy, obviously with smaller than usual margins because of the added perforations, perfed 12 by the way. The perforations are well done and don't hit the stamps design. It's not very valuable anyway, only about $20, but what do the added perforations do to the value of the stamp? I like it very much because of the novelty and I have the regular rouletted version as well, they make a nice pair!! And why would someone even bother to add the perfs in the first place? I've read that some companies or individuals did this, I'm just not sure why.
re: What do private perfs do to value?
I think it's a mutilation, the same as using a razor to create a straight-edge where there were once perforations.
While there may be exceptions for generally recognized "private perforations" (e.g. some German-Austria as noted in Scotts) I would say the stamp may still be fun to have in your collection (and noted as such) but the value would be a small fraction of the unaltered stamp.
Just an opinion, with no expertise implied.
re: What do private perfs do to value?
I agree, but it's still interesting to have in the collection. Thankfully it's a low valued stamp anyway!
re: What do private perfs do to value?
The key word here is "mutilated" which by definition means something that's not normal, therefore a mutilated stamp should have less value than a normal stamp, otherwise everyone would be mutilating stamps on purpose to give them more value.