These are Canadian '60th and 87th Battalion' 1936 reunion badges, made by 'Birks'
- a well known jeweller in Canada. All have threaded screw back posts.
I found them at an Antique Mall about five years ago and recognised
that they were some type of WWI insignia. They were marked
$2.50 apiece, so I bought all three.
A few months back, I saw one on ebay and found out exactly what
they were - I did not know beforehand. I watched that one pin
on ebay sell for $80 !