Connector Identification

No numbers on this that I can find. Looking to find this 4 pin connector and its mate. Having trouble narrowing it down to less than a couple hundred. Help!?

Thank you very much for these photos. Having the size reference helped to make sure I focused on only the connectors of the correct size. Unfortunately, I, too, was unable to find a match for the connector shown. The largest issues I found were the keying and fastening.

Thanks for your help. Do you have any suggestions as to where else I could look?