Can anyone ID this helicopter fuse?

[PTMcLain]

This nice fiberglass fuselage was given to me over 20 years ago. Just sitting on a shelf since I’m primarily an airplane geek.
it is 55” nose to tail fin. Main shaft hole is 34” from tail blade shaft.
I want to paint and build with Align or Pheonixtech mechanics but not sure if it’s 600, 650 or 700 size.
New to this forum also. Would anyone like to guide me through this build

[thebirdman]

Why not contact them, there still around....maybe they will offer you 500 million ? :)
be the best way to start?
birdman

[PTMcLain]

I looked. Can’t find them. Only seen one comment that they went out of business years ago.
Got and address or link?
Tks

[thebirdman]

Precision Aerobatics R/C Models - Best Aerobatics Model Airplanes

Maybee a different co ?

[PTMcLain]

I would like to talk to them but really just need someone to look at the measurements from main to tail and suggest mechanics that would fit.
I don’t have a source nearby to look at.
Tks

[thebirdman]

what is it?

[PTMcLain]

Don’t know. I’m just going to build it as a sport scale initially.
If I find out what it is, I’ll decide what to do then.
It’s an over the winter project. I have a big learning curve to work on.

[Usalty2]

it looks like a close version of the black shark.. used in fai/f3c in japan...

https://1.bp.blogspot.com/-o-4fp54HX1o/U16pUCrZuQI/AAAAAAAAIxY/TEk74h5FSqM/s1600/IMGP3859.JPG

[mongo]

what is the diameter of the tail boom hole, that will be the limiting factor.