Vintage North American stamp grid

Objective: Create a clean, retro-illustrated stamp gallery for a North American city map series, serving as a collectible UI or exportable resource. Canvas: Landscape canvas, approximately 870 x 653 pixels, off-white background, with ample margins and even spacing. Arrange the stamps precisely in a 3x6 grid, totaling 18 stamps. Each city appears in a pair: the first is a sepia monochrome stamp, and the second is a soft full-color version. Layout: Use three horizontal rows, six stamps per row. Leave ample white space between stamp pairs and rows. Add a light gray export filename label to the lower left of each stamp pair, such as “stamp-export-atlas-north-america-46”, “stamp-export-atlas-north-america-47”, “stamp-export-atlas-north-america-48”, and so on to all visible groups. Stamp Design: Each stamp is vertical, featuring cream-colored perforated edges, an aged paper texture, delicate decorative borders, and an oval or arched central illustrated window. "SOL" is marked in the upper left corner and "100" in the upper right. At the bottom of each stamp is a ribbon banner indicating the city or neighborhood name, with stacked location text below. The design utilizes engraved lines, vintage travel poster compositions, soft shadows, and slightly worn ink. Precise stamp count and label: Contains 18 individual stamps in left-to-right, top-to-bottom order: 1. Tan Boston, Massachusetts, USA (Narrow historic street scene); 2. Color Boston, Massachusetts, USA (Red brick buildings and streetlights); 3. Tan Charlotte, North Carolina, USA (Comfortable storefront street and "Noda" sign); 4. Color Charlotte, North Carolina, USA (Colorful buildings, plants, and blue sky); 5. Tan Chicago, Illinois, USA (Vertical "Chicago" theater sign and city buildings); 6. Color Chicago, Illinois, USA (Same theater sign with warm gold and cyan hues); 7. Tan Wake Park, Chicago, Illinois, USA (Storefront); 8. Color Wake Park, Chicago, Illinois, USA (Orange brick storefront and cyan sign); 9. Tan Cincinnati, Ohio, USA (Historic market building); 10. 11. Colored Cincinnati, Ohio, USA (The same market with brick orange, green accents, and a sky-blue background); 12. Tanned Cleveland, Ohio, USA (The interior of the magnificent arched arcade); 13. Colored Cleveland, Ohio, USA (The turquoise glass ceiling and warm interior perspective); 14. Tanned Dallas, Texas, USA (The skyline and the "Deep Ellum" sign); 15. Colored Dallas, Texas, USA (Vibrant street colors, turquoise sky, and the Deep Ellum sign); 16. Tanned Denver, Colorado, USA (The blue bear statue in front of the glass building); 17. Colored Denver, Colorado, USA (The bright blue bear and green glass facade); 18. Tanned Des Moines, Iowa, USA (Tudor-style house); 19. Colored Des Moines, Iowa, USA (Red roof, cream walls, green lawn, and blue sky). Text content: The stamp typography maintains uppercase and vintage serif fonts. Use customizable collection markers.{argument name="stamp currency text" default="SOL"} ,face value{argument name="stamp value" default="100"} and the file extension for exported files{argument name="export filename prefix" default="stamp-export-atlas-north-america"} City labels are retained in readable English, but the overall series theme is allowed.{argument name="atlas region" default="North America"} The visual effect is{argument name="stamp finish" default="alternating sepia engraving and muted full color"} Visual Style: Antique engraved postal prints, travel stamp forms, cream paper, fan-shaped perforations, subtle shadows, fine shading, warm sepia, faded inks, soft cyan, rust, ochre, brick red, and sky blue. Make the color stamps look like they were hand-colored, not modern digitally printed. Keep all stamps consistent in size and frame. Constraints: Do not add figures, logos, watermarks, or extra stamps. The core requirements are exactly 18 stamps in a 3x6 grid, 9 listed locations with sepia/color paired variations, clear city/state/country labels, "SOL" and "100" on each stamp, and a light gray exported filename below the group.