Whoa! Nice collection there bpm.
The Heligoland mutilated stationery piece, is common, I would think.
The Jamaican is a lovely piece, for me.
They represent a very difficult and consuming discipline, should you decide to specialise.
To whet your appetite, peruse this page by our Dave Elsmore..........
(Australian focus)
http://www.ozrevenues.com/Articles/cypher.htmCatalogue
https://goscf.com/t/53729