BEC: Good find on those kits!

I am near completion of my "Alpha Project"...I need to update this thread or start a new one: Link

I have the exact kit you show. As you noted, the header card lists both EK-25 and 1419 as the model no., called "Alpha II". The instructions that came with my kit (and I'm guessing yours as well) state the model number as 1419, and the title "Metric Alpha II". This particular kit originally came with a BNC-50K in the 70's, and was later replaced by the older style PNC-50k around 1980 (there was a note stating such in the kit). The longer engine mount was provided along with the fiber rings, but as shown in your kit, a separate tri-fold shock cord mount was included and the suggested mount method per the instructions. Fins were die-cut, and the Black/red Alpha decals from the 80's accompanied the kit.

Provided instructions were very close, but not exact, to this: Link

Hope this helps a bit.

-Eric-