MichaelG.
Assuming I am not misconstruing your question…..
Within the HTML for the page the post number is the <name > of the <table cell> containing the time stamp for a particular post (in the green banner next to the poster name).
As you point out, taken together the thread no. + page no. + post no. jump to the correct post but (it appears to me) one can only get the post number by looking at the page source.
It is possible to make it visible in the rendered page but someone would have to do a bit of editing.
Apologies 'if I got the wrong end of the stick'
Regards
Frank C.
edit: beaten to it — and a more concise answer
Edited By Chuck Taper on 23/03/2023 22:16:48
Edited By Chuck Taper on 23/03/2023 22:17:34
Edited By Chuck Taper on 23/03/2023 22:19:11