Hi Glenn noticed a few volcano stamps from the Philippines that you have not featured and thought you might like. Hope these are useful. They feature on my topical web site which includes Philippine volcanoes where there are some more details of the volcanoes but also some subsidary stamps such as mythical creatures said to reside on a particular volcano and volcanic geology. Introduction page for Volcanoes on Philippine Stamps (topicalphilippines.com),
Best Regards Mike
Laguna Volcanic Field Scott 3606b (2015)
Scott #1090 (1972) Mt Apo in the background
Scott 2508 (1997) again Mt Apo in the background
Scott 3302a (2010) Mt Makiling
The next all contain Mt Mayon in the detail and one is a 'volcano on stamp on stamp'
And finally some unidentified
I suspect this is Mt Baco on Mindoro island.
https://en.wikipedia.org/wiki/Mounts_Iglit%E2%80%93Baco_National_Park
It is the last stronghold of the Tamaraw.
https://en.wikipedia.org/wiki/Tamaraw
The geology of the Mt Baco region is complex including metamorphics, sedimentary formations and some volcanics. From my quick research its not clear if Mt Baco is a remnant volcano or simply a generic peak within a metamorphic/sedimentary mountain range.
https://openjicareport.jica.go.jp/pdf/10304657_02.pdf