If it has R134a in it I would keep it. It's far easier to deal with and readily available. The problem with R12 is that there aren't many shops with the equipment to deal with it. You can't recover R12 with a R134a machine as has been stated previously. You end up with a contaminated machine and tank.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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