1930's mahr-bufton company trave-l-eez pram carriage

I purchased this from a woman that said it belonged to her husband when he was born.  He was 74 years old.  I have looked this up but can't find the exact year it was manufactured.  The ones I've seen have solid metal wheels,  Mine are spoked, why?  I would like to have a value.  The canvas is a bit worn, water damage.  Everything else is in great shape.  It is missing the welds to connect springs to body for stablization.  It has all tags, but the model number is too faded to read.

Fair