Z036772? what sort of serial is that? The earliest ZAxxxxx numbers were placed on a sticker in the battery compartment. Does that mean this one is later than March 89? It's definitely not ZO36772 because that would decode to 2001 and this one is MIJ. It falls outside everything the serial number decoder is capable of decoding.
That would make more sense but it doesn't look that much like a C. At the time of ZB and ZC Boss used labels with very small letters and larger sized numbers. Even if it really is a ZC-pedal it doesn't match the looks of other pedals from the same period.