Pic Walsh Freight Co
St Louis, MO
MC-045657 DoT 66144
Plaza Investment Co is what PIC stood for . Sold to Gateway around 1973-75
Route Map - 1972
Profiled in Mike Terebecki's The Trucking Pioneers Book III (click image to see Book index)
Acquisitions
Patches of it that are in my project - Facebook Trucking Industry Insignia Patches
Other known patches
If you want your own trucking company memoribilia:
Items available on eBay
Note that patches sold by "freedomfifty2k" and "bob82ndabn325inf"are likely promo/replica patches, not patches actually used by the company represented.