Got a 296 wrench at auction yesterday. Have a 295 wrench which is P&O planter wrench but find no info on 296 wrench. They are identical in shape except for different opening size where pen is pointing in photo. Kingman 272 is also similar in shape. Looks like similar pattern used on 295 & 296. Is 296 a P & O wrench or a Kingman wrench or none of the two?