What is it?

[A901949@aol.com]

Hi guys,
Can anybody tell me what year this triumph engine is? Here are some of the 
numbers that I found on the block. On the left handside there's a 3 and an N 
below that next to the distributor there is a 1-2-52 the head has the word 
CROMIDUN. On the right side it has 3 C N. and below that it has 55 77 5 which 
is near the oil pan. It is set up for a single carburetor. Is this an early 
engine? Thanks in advance.
Tom

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