chainsaw ID help

[foresthawk]

Came into an older chainsaw lately, and was able to get it running.  Only thing missing is a chain.  Its a McCulloch, but don't see a model no. on the outside anywhere.
Inside the air filter cover is a  small metal tag, partly covered up, with a serial no. and I think a model no. thats says either 608005 or 600005 (can't make out which).
  Its smaller than the old 250, and looks like about a little smaller  than a 10-10, and maybe a little older than that (more rounded off housing, yellow of course).

Anyone know what model this might be, as I am looking to get a chain for it,
and determine what gas/oil mix ratio to use.
By the way,  it runs and idles beautifully.
Thanks for any help.

[sawguy21]

Can you post a picture? There are a couple of McCullocholics hanging around here.