A sloe gin sour with a touch of almond. If you opt not to follow my addition of vanilla bitters, then consider dropping the orgeat to 5ml (1 bar spoon)
This appears earlier than the 1934 edition. The 1908 ‘Latest Edition’ version (there are two 1908 editions on EUVS) has a section after the end of the previous edition named ‘Some new-up-to-now seductive American cocktails’; the Ocean Shore Cocktail appears there. That recipe has raspberry syrup as an alternative sweetener to orgeat.