Some more info...looks like it's an "A":
(Guat.) Regist.1940 Orig.1935 at place of Roy E. Wurtz, Encinitas, CA. Fruit; season, May-Sept.;color, green;weight, 8-10 oz.; shape, pyriform. (CAS Yearbook 1950) Orig. Encinitas, CA, by Roy Wurtz. Introd.1948. Chance seedling planted about 1935;selected about 1940. Fruit: Mex.-Guat. hybrid type; quality good; skin green, med.thick;long oval; size 7-10 oz.Tree:production fair to good; distinctive weeping growth habit, with dense cover of leaves & sm. limbs. (B&O Register) Easily available for the home garden through nurseries. Also called Littlecado or Minicado or Dwarf Hybrid depending on propagating nursery.(J.R. Frink 2000) Origin, CA; Race GxM; Flower group, A (Lahav & Gazit) (originated in 1935 at Encinitas, CA; cultivated in Queensland for only the past12 or13 yrs.);pear shaped,sm.-med.;8-12oz(226-240g); seed lg. Season:May-Sept. in CA;late in Queensland. Tree is small&slow-growing, bears moderately but regularly. More than 100 trees may be planted per acre (240 per ha). (J.Morton 1987)