Adventure Comics #300 (1962) CGC 6.0 is a landmark early Silver Age issue featuring Superboy and the Legion of Super-Heroes during one of the team’s foundational growth periods. Published by DC Comics in September 1962, this issue continues the expanding mythology of the Legion and includes key appearances of core members including Superboy, Cosmic Boy, Lightning Lad, Saturn Girl, Sun Boy, Triplicate Girl, and Mon-El.

Issue #300 represents an important transitional period in Legion history as the team gained popularity and moved toward becoming a permanent backup feature in Adventure Comics. The cover prominently highlights Mon-El leaving the Phantom Zone and joining the Legion, a notable development in early Legion continuity.

This copy is professionally graded CGC 6.0 (Fine) with Off-White pages, presenting strong eye appeal for the grade. Silver Age DC books from 1962 continue to see steady collector demand, particularly those tied to early Legion appearances and pre-Crisis Superboy mythology.

Key Highlights:

• 📅 September 1962 – Early Silver Age DC

• 🦸 Superboy & Legion of Super-Heroes feature

• ⭐ Early Mon-El Legion storyline

• 🏷️ CGC Universal Blue Label – 6.0 Fine

• 📄 Off-White Pages

• 🔥 Strong mid-grade investment copy from a key Legion run

Ideal for:

• Silver Age DC collectors

• Legion of Super-Heroes investors

• Superboy completists

• CGC-graded DC portfolio builders