My dad figures these bottles have been in the basement for maybe 15 years, so UGH, that beer would be skunky, I'd bet. I'll let they buyer give it a taste if brave enough!
My dad has several cases (24 each) of Christoffel Robertus 330 ml (about 11.2 oz) flip top bottles. About five cases with the old beer still in, and three which have been emptied and labels removed. I think at one time he planned to use them to bottle his maple syrup, but then he retired from...