Excursion Walnut SG – solid spruce top with laminated walnut back & sides (dreadnought) Excursion Walnut Mini Jumbo SG – like the walnut SG but in a jumbo shape (but not as big as a jumbo) Excursion Walnut 12 SG – 12 string version of the walnut SG; All models come with the option of electronics and built in tuner. Seagull Guitars Walnut 12 has 0 ratings (Score 0 out of 5 based on 0 ratings ).. Disclaimer. This page contains information, pictures, videos, user generated reviews, automatically generated review and videos about Seagull Guitars Walnut 12 but we do not warrant the quality, accuracy or completeness of any information on our web site. Seagull Walnut 12 SG 12-String Acoustic-Electric Guitar Gear returned in mint condition. The Walnut series is Seagull`s most affordable one in the acoustic guitar section of the catalog. If you're looking for a virtually new instrument in possibly less-than-perfect packaging, this is a great value. It offers a quartet of non-expensive dreadnoughts, two with six strings and two with twelve strings (each Walnut series division has one fully acoustic and one acoustic-electric option). The Walnut 12 from Seagull is a well-built, budget-friendly 12-string acoustic that produces a consistent, gorgeous tone. It pairs a select solid cedar top with walnut back and sides, and a silver leaf maple neck with an Indian rosewood fingerboard.