Provide a DETAILED description of ALL markings on the weapon.
Check the receiver, barrel, under the forearm
If your over under shotgun was made prior to 1964,then the model of your Browning shotgun should be named the superposed.
under the forearm stock
Impossible to answer without a detailed description.
No such model designation.
Sometimes they will within a particular model.
about a grand
This serial number is too high to be the Browning High Power. What model is it? It may be an FN model under brownings patent, but not a Browning arms Co gun. Please be specific about the model and ask again.
The code after the "pm" is the model type. Are you sure it says 143? Browning doesnt list a model 143 Citori, but they did have a "153". The 153 denotes the Hunting model Grade l with a 3" chamber. According to info I found, 143 indicates a trap with a Monte Carlo stock. I do not know why Browning does not list it.
It needs to be re-fitted by a qualified Gunsmith. There is no simple way to do this.
I would need to know what model of Browning over/under shotgun you are asking about in order to help you.
1997