The L-5CES was a particularly fine instrument, and as such was made in relatively small numbers, and had a relatively high purchase price. Favoured by jazz musicians, most notably Wes Montgomery, it had a hand carved top; a feature of only the very best guitars. It was first available in 1951, and is still available today - either in sunburst or natural finish. Initially the pickups were P90 single coils, changing to Alnicos from 1953 to 1957. Thereafter the Gibson humbuckers came as standard.
As previously mentioned, the L-5CES was an expensive instrument - only cheaper than the Super 400 and Johnny Smith (and the Citation, when it was launched). After 1962 it was marked in price lists as a custom order instrument - but despite this, sales rose throughout the 50s, 60s and 70s.
The following description is taken from the 1970 Gibson electric-acoustics catalogue
L-5 CES - Cutaway
Professional musicians enjoy the fast neck action and quick response of the L-5 CES. This electric acoustic offers performance to match its rich, impressive appearance.
FEATURES: Carved top of select close-grained spruce. Carved back of curly maple with matching rims. Slim, fast low-action neck joins the body at the 14th fret. Five-piece curly maple neck, adjustable truss rod. Ebony fingerboard, pearl block inlays. Adjustable Tune-O-Matic bridge. Exclusive L-5 tailpiece. Powerful twin Humbucking pickups. Separate tone and volume control for each pickup. Three position toggle switch to activate either or both pickups. Gold-plated metal parts. Deluxe individual machine heads. 17" wide, 21" long, 3 3/8 " deep; 25 ½ " scale, 20 frets.
L-5 CES - Sunburst
L-5 CESN - Natural
600 - Faultless plush-lined case
ZC-6 - Deluxe zipper cover for 600 case