Wiktionary
if memory serves
phr. (non-gloss definition: used to make a statement, assuming one has correctly remembered the details)
Usage examples of "if memory serves".
And if memory serves me now, I must aver that what we see through the legends, the books of magic, and the demonologies is a legion of entities which can be called up by name, and commanded by witches or sorcerers.
Especially do we dislike keeping one when it directly concerns our elder daughter, who, tomorrow, if memory serves, will celebrate her nineteenth birthday.
Including, if memory serves, entirely unconvincing yowls from a departed pet cat.
She changed the subject, if memory serves, to the dog's bladder infection.