The only way I can think of is to look at the pin between the link and see if you can see a split bush. You may be able to use a thin rule to see if it reaches in as far as the track pin. If it does it's the master.
I have the same problem with my 305CR excavator tracks. I have to remove a link but I can't identify the master pin so I put the rubber tracks back on for now.
As PhilC says, as a last resort use a feeler gauge (hack saw blade etc) to fish for the short bushing.
[attachment=67443]Checking for Master Pin #1.jpg[/attachment]
[attachment=67444]Checking for Master Pin #2.jpg[/attachment]
Ok not a bad idea, thanks guys
just a suggestion once you find it mark the ends with a M so you can find the bloody thing easily next time. a large letter stamp should do or a engraver
Forgot to mention check both sides of the chain as the link may be hard up against one side but have clearance on the other side.
Also as tk88 said mark it for future reference but use a grinder or drill a witness hole in the end of the pin. Especially if you have track guards on as they will obliterate engraver or letter stamp marks.
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