Since 504 is a 5-cent blue perf 11 stamp, I suspect you are referring to 534B ... which is an imperf type VII. Added: At first glance, it does appear to me to be type VII. But I am no expert. I do remember one of the experts on this forum warning me about type VIIs with vending machine perfs being trimmed to look like their more expensive imperf counterparts. I do not know whether this is germane to your particular stamp.
I agree, not an offset printing. I suggest you compare the detail in the leaves (say to the left of Washington's nose) with those on an offset printed version of this issue.
The following link might help you. http://stampsmarter.com/learning/Ma...methods.html Added: You can also to to philatelicfoundation.org & do a search on their certificate database. 534B would be an obvious choice for an offset stamp. Compare the images of certified 534Bs with your stamp.
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