Medieval Austrian coins

Hello, can anybody give some help with identification of those 2 Austrian coins?

The first one is in bad condition so it will be difficult, but lets try. Dimensions is 16x14mm, weight 0.93g.

The second one resembles pfening of Ferdinand I, which corresponds also with the year 155*, but I could not find such coin here or elsewhere (with crowned Austrian shield dividing the date) - what type could it be? Diameter is 14mm, weight 0.30g

Both coin are uniface (smooth reverse).

Thanks for Your help!

It seems like the one on the right should be findable, but no luck.  Ferdinand I struck one-sided pfennigs with a double coat of arms inside a square in the 1520s/1530s (no crown).  Maybe this one is after he became emperor (1556) explaining the crown?  

Probably need someone with a specialized Austria catalog.