HP-27S 50th Anniversary Limited Edition really?

[rprosperi]

My guess is this was an internal prototype for what would eventually become the 14B/32S 50th AE. It appears they were considering using the 27S as one of those AE models? Silver certainly looks better on a 27S (with silver trim and Blue labels), while Gold looks better on the 14B and 32S (with brown trim and Yellow/Gold labels).

In any case, yes indeed, quite rare!! Congrats on a nice acquisition.