This stamps appears to have the small OS. The catalog number depends on the watermark. Watermark 8 - Catalog# OB4 Value $60 Watermark 10 - Catalog# OB46 Value $7.50 These values are from a 2005 catalog so are probably higher now.
Thanks Dakota ! I usually figure on the lower value.
Its hard to tell the crown..has a smudge of hinge remnant but the A appears to be the thinner one.
My Classic is from 2015, and I plan to get the 2020 next month. Here are the values: OB4 = $125.00 OB46 = $16.00
The following values are from the 2019 Edition of the Scott Classic Catalogue. OB4 - Used - $160.00. OB46 - Used - $16.00. Nice steady rise in value for that OB4 issue over the past few years.
In case you use a Stanley Gibbons cat. # O19 first watermark indigo (die ll) used £140 # O44 Third watermark deep blue (die ll) used £25 SG doesn't show the second watermark with OS punctured 2½d (that I can find in my 2015 cat) 2½d first watermark also had the large punctured OS #O4