My money says yours is the 133rd Cdn2 if you go by CFRs, and around 37 if you go by the serial numbers.
If you go to Clive's ramtank.ca, he has listed all the CFRs and serial numbers of the M38A1Cdn2 and Cdn3. The Cdn 2s run from CFR 07700 to just under 08500. The serial numbers are in sequence for the most part, but appear to be in batches. Any small gaps in the serial numbers likely reflect disposal of that particular CFR prior to 1977 when the computerized records started.
http://ramtank.ca/m38a1%20index.htm
The lowest serial number listed in the Cdn2 batch is 96842 and the highest I spotted was 97765, for a difference of 923, so there is some large gaps in there somewhere.