Please Help Me Identify This Stamp On Postal Card

Thank you

Number #300b
Don

Thank you, is it valuable to send it in for a certificate?

No, it is worth pennies.
Don

Thank you

While the Scott catalog lists 300b complete booklet panes of 6 at premium prices, Scott has yet to recognize/price pieces of booklet panes like this, either mint, used, or on cover. They are readily identifiable from their sheet counterparts by height/width differences. Some collectors have obtained certs for their on-cover booklet panes examples and ask huge prices for them, but I see no sales at these high prices when booklet singles and pairs are still findable on cover for modest prices. Even if priced by Scott, booklet singles on postcards would be the most commonly found item and not merit a price even close the cost of certification. Until the listings are added, the card itself drives the value of what you show.

AEF booklet singles, perforated on four sides, imperforate top margin, imperforate bottom margin and imperf top corners, are highly sought after, especially on cover. Off cover examples are not easily found. Some First or Second 2 cent booklet single varieties may not be so easy to find either.

A few years ago I found 5 matching corner covers from a tavern each with a pair of the 1c booklet stamps. I looked for the 6th cover but never found it. Bill Langs had 2 covers similarly franked and he was asking $900 per cover and his weren't corner covers. I had Bill W certify 1 of them and eventually sold the set for $489 and was pretty happy.