Dayum, it's good to see that you're still with us!
Rod, thanks for the plug my friend, sounds like the RMK timeline is working for ya!
Ken, as you've said, the Brown Micarta on the #3 in question is a different type than the linen type used on those early #17 'Astro's' of '61-'62...and being that we both know that the Brown Canvas was used on the #'s 14/15/16 from late '64 into '66, (we are talking about an older knife, correct?), then...
With the Brown canvas Micarta introduction in the mid-60's, it sounds like the knife you saw was either a special order, or someone at the shop was 'spearimentin' with some new material to see how it was going to work out, and as such the production numbers would be very low. (It seemed to have worked out well; black Micarta has been a shop option on most knives since '67 or so...)
As to the seven spacers, that's the easy part...it was five spacers on (most) leather handled versions at the time, and seven on non-leather versions (wood, stag, Ivory, etc...). So, as a non-leather handle, seven would have been the rule.
Did you get pics by chance? *grin*
Good to see ya again Ken, we should talk...email for the #
Mel