CAF update and a related Dave Cockrum fanzine work question 1 1

[Gal Schwartz]

Hi guys,
I was happy to buy the original art to this nice Dave Cockrum pinup
from THE COLLECTOR #24 fanzine, published in 1971 (in full color !).

Here's my CAF post of it:
https://www.comicartfans.com/GalleryPiece.asp?Piece=1538944&GSub=14281

You can see the published version in 'additional images' 
(thanks to Ken Meyer Jr.'s 'INK STAINS' blog: https://comicattack.net/2015/06/01/is-72-tc-24/).

 

I'd like some help from Dave Cockrum experts - 
is this the first Superman or Superboy image he'd published 
(in a fanzine or elsewhere) ?

If not, please let me know when and where was his first 
(fanzine) Superman published.

 

Many thanks, 
Gal

Edited March 30, 2019 by Gal Schwartz