REMINGTON 1100 MAGNUM ID INFO

I recently purchased a Rem. 1100 Magnum. It has a 30" full choke VR barrel. The odd thing about it is it has a matte finish on both the barrel & receiver. The finish on the wood is also a matte finish. 3" shells and has a black Rem. recoil pad. Barrel code looks like LF25. Serial number is P0057xxM.
Would like to know model name, date of manufacture and approx. value in 98% condition. Thanks.