Nah, looks like the measurement frequency was 1 kc/s (= 1 kHz, that's how old the part is). OC71s have a f_T of 300 kHz and I think the OC70 is just a lower gain variant. Those transistors were used in audio circuits and I'm sure they will work in that spectrum. You don't need high frequencies in a clock, probably the highest frequency is your proposed tuning fork.

You could call your project the Lemonade Clock 🤪 because if you're stuck with hundreds of lemons, make lemonade. It would be quite an achievement because according to an anecdote those parts cost a week's wages back in the day and an apprentice was sacked for amusing himself by crunching the glass cases under his boot. <http://www.wylie.org.uk/technology/semics/Mullard/Mullard.htm> That's a very interesting site BTW. So 400 OC70s would be 8 years wages! The 8-years Wages Clock could be another name. 😉

Fortunately I have only a handful of Ge parts and they're no use to me as it seems the only reason people seek them out is for making guitar fuzz boxes with a distinctive sound. It isn't even essential to #A Germanium 1 Hz round tuit despite the title; a Si transistor would work there too.