Finally Found This R88A Plate Variety. Been Looking For One For Years

The doubled frameline plate varieties on the $5 and $10 denominations aren't too difficult to find on the perforated stamps, but finding the same ones on imperfs can be tough as heck. I would argue that the values shown in Scott are way understated compared to their actual scarcity. There's a number of them I still don't have, despite being on the hunt for approximately two decades.

In my opinion, the varieties should carry a much higher premium percentagewise on the imperfs than the perforated stamps.

This is an example of R88a with doubled top frame line. The last year of the date could be a 3, 7, or 9, depending on the penmanship characteristics. Given that there is no break in the stroke, I'm leaning 7, which makes it likely a west coast late usage.