On Wed, 5 Feb 2020, Clem cole wrote:

> FWIW. When it was written, Ted and I used pronounced it as “fisk” 
> (rhymes with “disk”), but F. S. C. K. was always acceptable to my ears. 
> I admit I smiled one time when I heard some one call it “f-sick” but 
> that was not considered the proper pronunciation.

I've heard it pronounced as "fuzz-chuck" (!).  Me, it's eff-ess-see-kay.

-- Dave