I agree it looks compatible with Pioneer numbering system but it's not part of the 370,046 entries in the Pioneer Parts listing (it stops at VWV-106).
However...
Pioneer Parts GXX1135 for AC3RF on YAJAttachment:
GXX1135.jpg [ 166.03 KiB | Viewed 1954 times ]
November 1996, Pioneer
GXX1135 that is a range of ref# reserved for Accessories, IC, Parts, etc. Pioneer kits.
Julien