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it was about £50k
Size of the bore.
what do you want for it
A shotgun in 12 gauge.
Probably not.
A lightweight 12 gauge shotgun.
100-400 USD
Read the owner's manual or have a gunsmith do it.
Unlikely
This is a Browning Auto-5 Lightweight 12 gauge shotgun.
It shouldn't say light twelve on the barrel, but on the receiver. Light twelve means that the gun is a light weight version of the standard Auto5 shotgun.
It a Savage models ... 30D, 30E, 30F or Stevens model 67