{Collins} Filter ID help



Gentlemen:
 
I have a filter that looks like it is for an S-Line (75S-3B/C), but I'm not sure what it is because of the part number. The part number on it is "Q-1/7  P2." 
 
Can someone tell me what it is or if there is a corresponding part number that I can use to see what it is?
 
Thanks.
 
73,
 
Dick, K5IU


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