Excellent condition, 8,5/10, Made in USA, including modern brown Gibson hardcase with pink interior.

The weight is 4,79kg, ebony fingerboard, gold hardware with Speed Winder tuners, all original parts including the pots which are dated 13778x8, 1377816, 1377816 and 1377848.

Only slight fret wear, some tiny dings, an additional 4-digit number under the regular serial is 2629 and only (?) 3411 have been reported ever made according to the shipping ledgers, this is a celebrity owned guitar from the legendary Norwegian musician Jan Groth (famous from the early prog rock band Aunt Mary etc).

More info from the article The Gibson Les Paul 25/50 Anniversary Model: "The Most Les"
By Mike Slubowski

January 2003:

The highly figured, well-appointed Gibson Les Paul 25/50 Anniversary model was introduced in 1978 to commemorate 25 years of the Les Paul model guitar and 50 years of Les Paul being in show business. Some of the more "deluxe" features include coil tapping, fine-tuning tailpiece, split block inlays and a highly ornate headstock inlay, more info: The 25/50 model was issued to commemorate the 25th anniversary of the Les Paul model (a year late, since 1977 was actually the 25th year), and the 50th anniversary of Les Paul's career in the music business. Gibson had learned that there was a market for anniversary model Les Pauls after the success of the 20th Anniversary Les Paul Custom in 1974. Thus, even though it sported a sales price of approximately $1,200.00 at the time, the Les Paul 25/50 model was a success, with shipping totals of 3,411 of these guitars during 1978 and 1979. It is reported that a few were also sold in 1980, but shipping records are not available for that year. The 25/50 model is a distinctive model in the Les Paul lineage for many reasons, including the unique and intricate pearl and abalone "25/50" headstock inlay design, creative use of silver and gold hardware combinations (e.g., the tuners are gold with silver buttons), abalone side dot marker inlays, beautiful flamed maple top, five piece flamed maple neck, split block parallelogram inlays (one of only two Les Paul production models to sport these inlays), large control cavity, gold truss rod cover inscribed with "Les Paul Anniversary", brass nut, and a coil tap mini-switch (one of the few production Les Pauls with a coil tap until the Jimmy Page Les Paul was introduced).In addition to the above unique features, the 25/50 had multi-ply binding on the front and back of the body and the front of the headstock, a volute, Nashville bridge with TP-6 fine tuning tailpiece, black speed knobs, Schaller style "Gibson" tuners, and Series VII pickups. These Series VII pickups were potted with a black, rubber-like material that fills the gold covers and makes these pickups virtually impossible to remove from their covers for repair. All 25/50s were made in Gibson's Kalamazoo plant. The regular 8 digit serial number in "YDDDYSSS" format was used on the 25/50 (where "YY" is the year, "DDD" is the day of the year, and "SSS" is the production sequence number, with numbers below 500 used at Kalamazoo). In addition, the 25/50 has a four digit edition number, which presumably gave it that "limited edition" marketing image. The "Made in USA" stamp is also on the back of the headstock.

The 25/50 was considered a "special order" guitar, and Gibson ads suggested that all orders had to be completed by December 31, 1978. For original owners, a belt buckle with the "25/50" logo was provided with the guitar. The 25/50 was shipped in a Protector case with red lining. The neck of the 25/50 is of medium to large thickness. Frets are wide and of medium height. The Series VII pickups are powerful. The rhythm pickup on most 25/50s is a bit dark sounding. The coil tap allows for a variety of single coil sounds, and makes the 25/50 a versatile guitar sonically. The 25/50s are known for their burden on the shoulder. The three 25/50s profiled in this article weigh between 10 lbs. 5 oz. and 10 lbs. 8 oz.