There's not big problem to bond wires to IC or indicator.
My collection of LED pen watches (also have a few LCD ones. There are 3 working samples with papers from Elektronika 1 factory (Pulsar, Moscow), one moulage and one NOS Qualitron also from the factory, there a many foreign wathes I found among soviet protos. USSR engineers monitored all new models to make most interesting designs and functions.
The proof of the pudding is in the eating...