Hello again, @Laurie 02,
I plated your stamp below, one of your #11a, as 78L3.
Thank you for the better picture that helped me confirming it. Your stamp was not really complicated to plate, because it has a really nice characteristic. There's an extra outer frame line at right, which is a recut variety.
I used the plating wizard on the stampplating website and I put as characteristic a recut #8, (the extra frame line) and the plate possibilities were: 1L, 2L, 3, and 5L, because it's a #11a. And then, I did the research and I got 5 results, so 5 plate position possibilities, all from plate 3.
Plate 3 is the second most common plate. Around 77 million stamps were printed. The lower left corner of your stamp is missing, which make the stamp a "bad" condition one, but the cancellation is not hiding any important part of your stamp, and the large margin at right can let you remark the recut characteristic really well. So, except the lower left corner, your stamp is nice, so it is not entirely an "ugly" one.
A little recall: when you'll can, that would be really nice to get a better picture of the other #11a you proposed me to plate.
Hope you'll find all this useful,
CS
