Oh! Yes! it is......
In its original packaging unbroken seal and if it is clear it is as good as the day it was bottled. There may have been alittle evaportation of time but very little. 1951 would have been Corby's Distillery in Corbyville, Ontario, Canada. Sadly it closed not much left of the old plant. Most was taken up by Hiram Walkers Distillery in Walkerville or the other plant in Kelowna British Columbia. But also sadly ParkLane the brand is no longer made. Now as to price around 90-100 USD they will fetch at auction. Or if you really wanna enjoy a treat? Open the bottle and enjoy! ParkLane is a very enjoyable drink and highly recommended.
Cheers!!!!